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• significance of index name in creating an index (mySQL)

  - by Will

  I've done something like this in order to use on duplicate key update: CREATE UNIQUE INDEX blah on mytable(my_col_to_make_an_index); and its worked just fine. I'm just not sure what the purpose of the index name is -- in this case 'blah'. The stuff I've read says to use one but I can't fathom why. It doesn't seem to be used in queries, although I can see it if I export the schema. So ... what purpose does the index name serve? If it helps the line in the CREATE TABLE ends up looking like: UNIQUE KEY `clothID` (`clothID`)

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• Threaded application sleeps with other application

  - by DeeD

  I have a weird problem with my threaded software. I start 2 instances of the software. Each instance has 2 threads, one thread creates a socket to use, and the other one is uses the socket for communication. When one of the threads in one instance calls sleep(3), the other threads in the the other instance sleeps too. And the weirdest thing is that when I rebooted the computer, it works the first time, but after trying a second time, it sleeps like described. How is this possible? Is it using some shared resource?

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• Alternative to singleton for unique resources

  - by user1320881

  I keep reading over and over again that one should avoid using singletons for various reasons. I'm wondering how to correctly handle a situation where a class represents a unique system resource. For example, a AudioOutput class using SDL. Since SDL_OpenAudio can only be open once at a time it makes no sense having more then one object of this type and it seems to me preventing accidentally making more then one object would actually be good. Just wondering what experienced programmers think about this, am i missing another option ?

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• Apache file caching

  - by danp

  How does apache handle caching of certain files, and is it possible to explicitly say that certain files should be aggressively cached more than others, through the standard config files for a given host or virtualhost? To put it in context, I keep a lot of site content in various XML files, and I'd like to be able to say that this file will be used a lot, and therefore cache it as much as possible..? Does apache do this kind of thing intelligently and on the fly..? Will it observe which files are more popular than others and try to match cache hits appropriately..? Lots of questions in one, but the basic idea should be clear enough. edit: to be clear, these are resource files which are loaded and interpreted by PHP - but php as a process is spawned inside apache.. right? Please help!

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• Is it the filename or the whole URL used as a key in browser caches?

  - by Richard Turner

  It's common to want browsers to cache resources - JavaScript, CSS, images, etc. until there is a new version available, and then ensure that the browser fetches and caches the new version instead. One solution is to embed a version number in the resource's filename, but will placing the resources to be managed in this way in a directory with a revision number in it do the same thing? Is the whole URL to the file used as a key in the browser's cache, or is it just the filename itself and some meta-data? If my code changes from fetching '/r20/example.js' to '/r21/example.js', can I be sure that revision 20 of example.js was cached, but now revision 21 has been fetched instead and it is now cached?

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• Strange DataMapper (0.10.2) error. Please help!

  - by Joel M.

  See the full error here: http://notesapp.heroku.com/ I'm using DataMapper and dm-validations 0.10.2. No matter how much I tweak my models, I get the same error, or another one. Here's how my model looks like: class User include DataMapper::Resource attr_accessor :password, :password_confirmation property :id, Serial, :required => true property :email, String, :required => true, :format => :email_address, :unique => true property :hashed_password, String property :salt, String, :required => true property :created_at, DateTime, :default => Time.now property :permission_level, Integer, :default => 1 validates_present :password_confirmation, :unless => Proc.new { |t| t.hashed_password } validates_present :password, :unless => Proc.new { |t| t.hashed_password } validates_is_confirmed :password

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• WPF Creating an instance of a class in xaml

  - by Cloverness

  Hi, I have a problem with creating the instance of a class in xaml file. I thought you can do it like this: in the resource part of the user control and then use it in the xaml file (for example bind to it). But even tough the class I created is located in the same namespace it says that: "The type was not found. Verfiy that all assemblies were built, etc". How to get it right? is there another method? Thanks for suggestions.

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• jquery for each function

  - by jonathan p

  I have added a show more or less function to a div - this all works fine however now i need to only allow this functionality if a element is over a certain height in this case. there are numerous classes of the same so i need to do the check on each element. although i am having problems getting it to work see code below : $(document).ready(function() { $(".less").hide(); $(".more").each(function() { var actualHeight = ($(this).parent().parent().find('.appsList').height()); if (actualHeight < 150) { $(".more").hide(); } }); $(".more").click(function() { var paragraphHeight = ($(this).parent().parent().find('.appsList').height()); if (paragraphHeight > 150) { $(this).parent().parent().find('.appsHolderBody').animate({height:(paragraphHeight + 100) }); $(this).hide('slow'); $(this).parent().find('.less').show(); } return false; }); $(".less").click(function() { $(this).parent().parent().find('.appsHolderBody').animate({height:190 }); $(this).hide('slow'); $(this).parent().find('.more').show(); return false; }); }); Any help would be greatly appreciated - please note when i am targeting the parent using .parent.parent i know its not pretty but could'nt get it to run using eq(4) for some reason. so the main problem is with this part of code $(".more").each(function() { var actualHeight = ($(this).parent().parent().find('.appsList').height()); if (actualHeight < 150) { $(".more").hide(); } it hides all of the elements $(".more") instead of the ones that match the condition. html as requested <div class="appsHolder"> <div class="appsHolderBody"> <h5 class="appTitle">General Apps</h5> <ul class="appsList"> <li class="mainAppList">Resource Manager</li> <li><a href="">Launch</a> <a href="">Info</a></li> <li class="mainAppList">Resource Manager</li> <li><a href="">Launch</a> <a href="">Info</a></li> <li class="mainAppList">Yet Another App</li> <li><a href="">Launch</a> <a href="">Info</a></li> <li class="mainAppList">Yet Another App</li> <li><a href="">Launch</a> <a href="">Info</a></li> <li class="mainAppList">Yet Another App</li> <li><a href="">Launch</a> <a href="">Info</a></li> <li class="mainAppList">Yet Another App</li> <li><a href="">Launch</a> <a href="">Info</a></li> <li class="mainAppList">Yet Another App</li> <li><a href="">Launch</a> <a href="">Info</a></li> <li class="mainAppList">Yet Another App</li> <li><a href="">Launch</a> <a href="">Info</a></li> </ul> </div> <div class="appsHolderExpander"> <a href="" class="more">More <img src="/wps/PA_applicationsintros/./img/downArrow.png" /></a> <a href="" class="less">Less <img src="/wps/PA_applicationsintros/./img/upArrow.png" /></a> </div> </div> <div class="appsHolderAdvertising"> <div class="appsHolderBody"> <h5 class="appTitle">Advertising Apps</h5> <ul class="appsList"> <li class="mainAppList">ATEX</li> <li><a href="">Launch</a> <a href="">Info</a></li> </ul> </div> <div class="appsHolderExpander"> <a href="" class="more">More <img src="/wps/PA_applicationsintros/./img/downArrow.png" /></a> <a href="" class="less">Less <img src="/wps/PA_applicationsintros/./img/upArrow.png" /></a> </div> </div> cheers in advance

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• allow only distinct values in ComboBox

  - by Ravinder Gangadher

  In my project, I am trying to populate ComboBox from DataSet. I succeeded in populating but the values inside the ComboBox are not distinct (Because it just showing the values present in DataSet). I cant bind the ComboBox to DataSet because I am adding "Select" text at first of populating the values. Here is my code. ComboBox --> cmb DataSet --> ds DataSet Column Name --> value(string) cmb.Items.Clear(); cmb.Items.Add("Select"); for (int intCount = 0; intCount < ds.Tables[0].Rows.Count; intCount++) { cmb.Items.Add(ds.Tables[0].Rows[intCount][value].ToString()); } cmb.SelectedIndex = 0; My question is how to allow distinct values (or restrict duplicate values) inside the ComboBox.

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• JAR file folder for eclipse projects

  - by Daff

  I'm trying to create a centralized folder (in some kind of a "meta project" in my eclipse workspace) for commonly used JAR files for referenced projects in this workspace. It should work similar to the WEB-INF/lib folder for web projects but also apply to non web projects, and automatically scan and add all jar files in this folder. I tried to create a user library with these jar files and reference them in the project but I still have to add every new jar manually to the user library (and don't know if it is referenced relative of absoulute) and Tomcat (WTP) doesn't seem to take these files (Run As - Run on Server) into its classpath (and I don't want to duplicate the jars and put them into WEB-INF/lib). Any ideas?

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• Difference Between Two Lists with Many Duplicates in Python

  - by Paul

  I have several lists that contain many of the same items and many duplicate items. I want to check which items in one list are not in the other list. For example, I might have one list like this: l1 = ['a', 'b', 'c', 'b', 'c'] and one list like this: l2 = ['a', 'b', 'c', 'b'] Comparing these two lists I would want to return a third list like this: l3 = ['c'] I am currently using some terrible code that I made a while ago that I'm fairly certain doesn't even work properly shown below. def list_difference(l1,l2): for i in range(0, len(l1)): for j in range(0, len(l2)): if l1[i] == l1[j]: l1[i] = 'damn' l2[j] = 'damn' l3 = [] for item in l1: if item!='damn': l3.append(item) return l3 How can I better accomplish this task?

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• How can I measure distance with tastypie and geodjango?

  - by Twitch

  Using Tastypie and GeoDjango, I'm trying to return results of buildings located within 1 mile of a point. The TastyPie documentation states that distance lookups are not yet supported, but I am finding examples of people getting it work, such as this discussion and this discussion on StackOverflow, but no working code examples that can be applied. The idea that I am trying to work with is if I append a GET command to the end of a URL, then nearby locations are returned, for example: http://website.com/api/?format=json&building_point__distance_lte=[{"type": "Point", "coordinates": [153.09537, -27.52618]},{"type": "D", "m" : 1}] But when I try that, all I get back is: {"error": "Invalid resource lookup data provided (mismatched type)."} I've been pouring over the Tastypie document for days now and just can't figure out how to implement this. I'd provide more examples, but I know they'd be all terrible. All advice is appreciated, thank you!

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• how to databind a datalist's page index to a button's commandname?

  - by korben

  i got this inside a button inside a datalist CommandName="<%# Container.ItemIndex %>" when i click the button, i'm expecting commandname to = 0, then 1, then 2, etc, as the datalist progresses, and i'm using that value in the button click's c# but i'm getting this error, i'm pretty sure i'm using this exact setup on another page and i have no problems, any idea what's going on? Server Error in '/' Application. Compilation Error Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately. Compiler Error Message: CS0117: 'System.Web.UI.Control' does not contain a definition for 'ItemIndex'

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• Is there any way to generate a set of JWebUnit tests from an apache rewrite config?

  - by robbbbbb

  Seems unlikely, but is there any way to generate a set of unit tests for the following rewrite rule: RewriteRule ^/(user|group|country)/([a-z]+)/(photos|videos)$ http:/whatever?type=$1&entity=$2&resource=$3 From this I'd like to generate a set of urls of the form: /user/foo/photos /user/bar/photos /group/baz/videos /country/bar/photos etc... The reason I don't want to just do this once by hand is that I'd like the bounded alternation groups (e.g. (user|group|country)) to be able to grow and maintain coverage without having the update the tests by hand. Is there a rewrite rule or regex parser that might be able to do this, or am I doing it by hand?

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• CakePHP: Accessing the controller or model from a view helper

  - by tombazza

  I have a view helper that manages generating thumbnails for images. The images are stored using a unique ID and then linked to a file resource in the database. I am trying to find out if it is possible for the view helper that generates these images to access the model or controller directly, as it is not possible to load the image data at any other point in the controller work flow. I know this is a bit of a hack really, but it is easier than trying to rebuild the entire data management stack above the view.

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• I can't use achiva as a proxy of my remote repository

  - by user1553915

  I want to install Achiva to manage my Maven repositories. I add a new internal repository called "public" and a new remote repository, which is my company's repository. Then I configure the proxy connector to let the repository "public" to be a proxy of the remote one. But When I enter the address "http://localhost:8084/archiva/repository/public/.../....pom" in the web brower,error occurred "Unable to fetch artifact resource". However, if I replace the remote repository with another one such as "http://repository.codehaus.org/", the proxy works. I don't know why this happens, are there something wrong with my remote repository address?

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• Simple Sinatra Ajax Not Working

  - by proteantech

  I was trying make an AJAX call from a static file on my computer to a simple sinatra service. The ajax call was returning with an error and no details. The server logged no errors either. Another strange symptom was that the Origin in the request header was null. I turns out that you can't make cross domain ajax calls without a little extra effort. You can set the Access-Control-Allow-Origin header on your sinatra response to expose your service to external domains using a snippet like this: get '/hi' do response['Access-Control-Allow-Origin'] = '*' content_type 'text/plain' "Hello World" end There's also another header you can set to allow other HTTP Methods besides gets, Access-Control-Request-Method. You can find more information by searching around for CORS: Cross Origin Resource Sharing and the previously mentioned headers. Oh, and in case you want to do this in Rails as well you can do something like this in your controller: after_filter :set_access_control_headers def set_access_control_headers headers['Access-Control-Allow-Origin'] = '*' headers['Access-Control-Request-Method'] = '*' end

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• Is it bad practice to select upstream servers based upon the HTTP method?

  - by PartlyCloudy

  I'm wondering if it is bad practice to have a reverse proxy that selects the upstream server depending on the HTTP method used? The background is that I have an abitrary web server that handles POST requests with some logic behind. The same resources also contain static content, that can be retrieved using GET. After some benchmarking I realized that nginx would handle the static content way faster than my abitrary web server doing this. I checked the option to forward incoming requests internally using nginx, which is feasible. But this would lead to the fact that different servers would serve a distinct resource, only depending on issuing a GET or POST, including different header fields.

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• Is it possible to make a div 50px less than 100% in CSS?

  - by Derek

  Exact duplicate > http://stackoverflow.com/questions/11103728/css-to-achieve-width100-150px > http://stackoverflow.com/questions/8877827/how-can-an-element-have-a-width-of-100-50px-using-only-css > http://stackoverflow.com/questions/651317/div-width-100-minus-fixed-amount-of-pixels > http://stackoverflow.com/questions/899107/how-can-i-do-width-100-100px-in-css Is it possible to make a div 50px less than 100% in pure CSS? I want the <div> to be only 50px less than 100%. I don't want any JavaScript.

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• Mapping restful ajax requests to spring

  - by Diones

  I have this piece of code: @RequestMapping(value = "/test.json", method = RequestMethod.GET) @ResponseStatus(HttpStatus.OK) public @ResponseBody Object[] generateFile(@RequestParam String tipo) { Object[] variaveis = Variavel.getListVariavelByTipo(tipo); return variaveis; } As far as I know it should take a request to test.json?tipo=H and return the JSON representation of Variavel[], however when I make such request I get: HTTP Status 406 - type Status report message descriptionThe resource identified by this request is only capable of generating responses with characteristics not acceptable according to the request "accept" headers () By using the following function I can get the expected json: @RequestMapping(value = "/teste.json") public void testeJson(Model model, @RequestParam String tipo) { model.addAttribute("data", Variavel.getListVariavelByTipo("H")); } What I'm doing wrong?

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• Internal Server Error

  - by RPK

  I have a HTML file and a PHP file in the same folder on the remote server. From the URL, I call the HTML file and the HTML file calls the PHP file when form is submitted. But it is not going correctly. When I submit the Form, it dislays error: 500 - Internal server error. There is a problem with the resource you are looking for, and it cannot be displayed. What is the reason? Edited: The source of the PHP file is available [here][1]. The Form tag in the HTML file looks like: [1]: http://stackoverflow.com/questions/2470088/code-to-send-email-not-workingstrong text

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• Jquery canvas touch count

  - by user897764

  Can someone help me with a script I'm working with. http://jsfiddle.net/InVAMPED/XsG4e/4/ What I'm trying to achieve is placing a image where the user touches(ipad). There will be say 5 images that will each get attached once only. So first touch places img1, second touch imag2 etc untill all the images have been placed. Problem with my fsfiddle example is that when on ipad it doesnt count the first touch so you place the first image twice. it does duplicate the image on the second time just moves it to the second touches coordinates, then move on to 2, 3, 4, 5 as it should. any advice? or help to do this a better way? thanks

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• Can I learn the iPhone SDK and complete an app by September?

  - by Kuro

  Hi everyone, I'm wondering if it's realistically possible to learn the iPhone SDK and complete an app by the end of this summer. The app shouldn't be too difficult, it would just interact with my site's API and essentially just fetch, create, and edit resources. I already have a little experience with the SDK (and I'm comfortable with Objective-C), so I'm not completely new to it. Although here I things I don't know how to do and what I'd need to learn: Log in to my site using basic http authentication and store the user's username/password for all future requests Implement a toolbar at the bottom to navigate between different views Fetch and parse xml into list items Do POST/PUT requests to create/edit a resource on my server Are there any good resources available to learn how to do those tasks above? Thanks!

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• Writing Great Software

  - by 01010011

  Hi, I'm currently reading Head First's Object Oriented Analysis and Design. The book states that to write great software (i.e. software that is well-designed, well-coded, easy to maintain, reuse, and extend) you need to do three things: Firstly, make sure the software does everything the customer wants it to do Once step 1 is completed, apply Object Oriented principles and techniques to eliminate any duplicate code that might have slipped in Once steps 1 and 2 are complete, then apply design patterns to make sure the software is maintainable and reusable for years to come. My question is, do you follow these steps when developing great software? If not, what steps do you usually follow inorder to ensure it's well designed, well-coded, easy to maintain, reuse and extend?

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• 301 redirect, conflicting with RewriteRule

  - by user569711

  We did some maintenance today, and moved our web forums from /forums into the root folder of the domain. We put in a redirect 301 in a .htaccess file: Redirect 301 /forums/ http://www.ourforums.com/ However, we used to have some links that contained duplicate /forums folders. I.e. www.ourforums.com/forums/forums/forum.1 Obviously the redirect from above now leads to /forum.1, which odes not exist. I would like the old link to actually point to www.ourforums.com/boards/forum.1. I attempted to use something like: RewriteRule ^/forums/forums http://www.ourforums.com/boards/ [NC,R=301,L] Regardless of what I tried though, the Redirect seems to supersede any RewriteRules I put in the same file, regardless of whether I place them before the Redirect. Is there any way I can somehow ensure the RewriteRule is handled before the Redirect?

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